Introduction to String Matching and Modification …

Introduction to String Matching and Modification in R Using Regular Expressions Svetlana Eden March 6, 2007. 1 Do We Really Need Them ? Working with statistical data in R involves a great deal of text data or character strings processing, including adjusting exported variable names to the R variable name format, changing categorical variable levels, processing text data for using in LaTeX. Such tasks can be performed by using functions for String search ( or Matching ) and modification. R provides several such functions. The most commonly used ones are grep(), gsub(), strsplit(). When using them, it is important to know that some of their arguments are interpreted by R as regular expressions. What is a regular expression ? According to Linux help [3], regular expression is a pattern that describes a set of strings. Simply speaking, regular expression is an instruction given to a function on what and how to match or replace strings.

Introduction to String Matching and Modification in R Using Regular Expressions Svetlana Eden March 6, 2007 1 Do We Really Need Them ? Working with statistical data in R involves a great deal of text data or character strings

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